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Note 1 - Basis of Presentation (Details Textual) - USD ($)			3 Months Ended						9 Months Ended
	Mar. 07, 2025	Nov. 05, 2024	Sep. 30, 2025	Jun. 30, 2025	Mar. 31, 2025	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Sep. 30, 2025	Sep. 30, 2024	Oct. 27, 2025	Dec. 31, 2024	Mar. 06, 2024	Dec. 31, 2023
Net Income (Loss) Attributable to Parent			$ (7,072,000)	$ (7,730,000)	$ (9,593,000)	$ (6,793,000)	$ (8,872,000)	$ (6,850,000)	$ (24,395,000)	$ (22,515,000)
Working Capital			2,400,000						2,400,000
Cash Provided by (Used in) Operating Activity, Including Discontinued Operation									(12,010,000)	$ (15,322,000)
Interest Paid, Including Capitalized Interest, Operating and Investing Activities									1,125,000
Paid-in-Kind Interest									2,072,000
Dividends Payable, Current			1,265,000						1,265,000			$ 1,288,000
Capital Expenditures Incurred but Not yet Paid									1,700,000
Series A Preferred Stock [Member]
Dividends Payable, Current			$ 1,270,000						$ 1,270,000
November 2024 Direct Offering [Member] | Certain Institutional and Individual Investors [Member]
Stock Issued During Period, Shares, New Issues (in shares)		7,000,000
Shares Issued, Price Per Share (in dollars per share)		$ 3.34
Proceeds from Issuance of Common Stock, Gross		$ 23,400,000
Proceeds from Issuance of Common Stock, Net		$ 22,100,000
March 2025 Direct Offering [Member] | Certain Institutional and Individual Investors [Member]
Stock Issued During Period, Shares, New Issues (in shares)	5,715,000
Shares Issued, Price Per Share (in dollars per share)	$ 3.5
Proceeds from Issuance of Common Stock, Gross	$ 20,000,000
Proceeds from Issuance of Common Stock, Net	$ 18,300,000
Senior Secured Convertible Terms Loans [Member]
Debt Instrument, Face Amount													$ 20,000,000
Secured Non Convertible Terms Loans [Member]
Debt Instrument, Face Amount													21,200,000	$ 20,000,000
Convertible Loans [Member]
Debt Instrument, Face Amount													$ 16,000,000
Lytton Agreement [Member] | Subsequent Event [Member]
Debt Instrument, Face Amount											$ 51,000,000

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